b=\frac{a*p}{100}" alt="\frac{b}{a}*100\%=p\%; => b=\frac{a*p}{100}" align="absmiddle" class="latex-formula">
a=\frac{b*100}{a}" alt="\frac{b}{a}*100\%=p\%; =>a=\frac{b*100}{a}" align="absmiddle" class="latex-formula">
bc=ad" alt="a:b=c:d; =>bc=ad" align="absmiddle" class="latex-formula">
a:c=b:d;" alt="a:b=c:d;=>a:c=b:d;" align="absmiddle" class="latex-formula">
d:c=b:a" alt="a:b=c:d;=>d:c=b:a" align="absmiddle" class="latex-formula">